The diversity of structure, function, and behavior in
living organisms is primarily the result of
a. reproduction.
b. heredity.
c. evolution.
d. chance variations in living organisms of the
same generation.
e. artificial selection.
Answer: c
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Many pathogens can be readily grown in laboratory culture
Indicate whether the statement is true or false.
Electrons move about the nucleus of an atom in the same way that
A) insects fly around a bright lamp at night. B) cars are parked along the sides of a street. C) boats cross a lake. D) birds migrate to a new winter home.
Which statement provides the best explanation of the need for self-tolerance screening of lymphocytes?
A) The process which generates the vast array of diverse antigen receptors is a random process that could produce receptors which will bind to the body's own tissues. B) Self-tolerance involves "self" lymphocytes which bind to and form a protective layer over all body tissues. C) Lymphocytes which would attack the body's own tissues are never generated. D) The process which generates the vast array of diverse antigen receptors is a highly-controlled process, so the generation of receptors which can bind to the body's own tissues is a rare occurrence due to a genetic mutation. E) It is necessary to have some lymphocytes with receptors that are self-tolerant to respond to intracellular infections by viruses.
Because peptidoglycan lies outside the plasma membrane, all steps in the complex synthesis process of this molecule takes place outside the cell.
Answer the following statement true (T) or false (F)